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Synthesis of Monomers for Promising Membrane Materials, Polyalkylenesiloxanes

Authors
  • Ushakov, N. V.1
  • Finkel’shtein, E. Sh.1
  • Grushevenko, E. A.1
  • Volkov, V. V.1
  • Borisov, I. L.1
  • 1 Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia , Moscow (Russia)
Type
Published Article
Journal
Russian Journal of Applied Chemistry
Publisher
Pleiades Publishing
Publication Date
Nov 01, 2020
Volume
93
Issue
11
Pages
1646–1654
Identifiers
DOI: 10.1134/S1070427220110038
Source
Springer Nature
Keywords
License
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Abstract

AbstractSynthesis of monomers is the key and most labor-consuming step in the development of highly selective membrane materials. Polyalkylenesiloxanes show promise for separation of vapors of organic components from gas mixtures. The paper considers two approaches to the synthesis of 1,1,3,3,5,5-hexamethyl-2-oxa-1,3,5-trisilacyclohexane, a monomer for preparing poly-bis(dimethylsilmethylene)dimethylsiloxane, a promising polymer material for gas-separation and pervaporation membranes. Modified synthesis procedures using both approaches, closure of the six-membered ring via formation of the Si–O–Si or Si–C bond, are suggested. Comparative analysis shows that, among organomagnesium cyclization methods, the one-step method in a diethyl ether or diethyl glycol dibutyl ether should be preferred. The suggested procedure allows reaching the monomer yield as high as 75–80% and more.

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